From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 9FA8B7F47 for ; Wed, 26 Aug 2015 02:25:39 -0500 (CDT) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by relay3.corp.sgi.com (Postfix) with ESMTP id 2ADCDAC005 for ; Wed, 26 Aug 2015 00:25:36 -0700 (PDT) Received: from mail.lichtvoll.de (mondschein.lichtvoll.de [194.150.191.11]) by cuda.sgi.com with ESMTP id oxjmAIjLYlbKOk2I for ; Wed, 26 Aug 2015 00:25:34 -0700 (PDT) From: Martin Steigerwald Subject: Re: Performance impact of mkfs.xfs vs mkfs.xfs -f Date: Wed, 26 Aug 2015 09:25:33 +0200 Message-ID: <1594865.42kc89uJrg@merkaba> In-Reply-To: <20150826010923.GX3902@dastard> References: <55DD0AAF.9090401@opensuse.org> <20150826010923.GX3902@dastard> MIME-Version: 1.0 List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com Cc: "Carlos E. R." Am Mittwoch, 26. August 2015, 11:09:23 schrieb Dave Chinner: > On Wed, Aug 26, 2015 at 02:39:11AM +0200, Carlos E. R. wrote: > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA256 > > > > On 2015-08-26 01:43, Dave Chinner wrote: > > > On Tue, Aug 25, 2015 at 04:09:33PM -0700, Shrinand Javadekar > > > > > > wrote: > > >> Formatted the new disks with mkfs.xfs. Ran the workload. > > >> Reformatted the disks with mkfs.xfs -f. Ran the workload. > > > > > > Anyway, please post the output so we can see the differences for > > > ourselves. What we need is mkfs output in both cases, and xfs_info > > > > > > output in both cases after mount. > > > > Suggestion (for the OP): > > > > To reformat a third time without "-f", you can reformat as ext4, then > > format a second time as xfs. > > That doesn't work - mkfs.xfs detects that the device has an ext4 > filesystem on it, and demands you use -f to overwrite it. > > > But to imitate a new disk, you have to > > zero it with dd. > > Only the first MB or so - enough for blkid not to be able to see a > filesystem signature on it. wipefs command. Thanks, -- Martin _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs